One in five broadband customers overall had had problems with speed, but 17% suffered frequent connection dropouts, 12% had a fault with the wireless router and 8% had no connection at all for hours or days at a time.

Separately, the results of Which?’s latest Consumer Insight survey also found that trust in the broadband industry stood at 41%, down three percentage points since last year.

Alex Neill, Which? managing director of home products and services, said: “Far too many people get a poor deal from their broadband provider, with problems ranging from very slow speeds to going days without any connection at all, which just isn’t good enough.

“The regulator must now deliver on its plans to improve the information that customers get about speeds when they sign up to a provider and allow them to easily exit a contract if they’re not getting what they’ve been promised.

“Customers who aren’t satisfied with the level of service they’re receiving should look to switch.”